Which term of the AP: 121, 117, 113,……… is the first negative term?
[Hint:Find n for `a_(n) lt 0`]

If the sum of the first n terms of an AP is 4n-n^(2) , what is the first term (note that the first term is S_(1) )? What is the sum of first two terms? What is the second term? Similarly, find the 3rd, the 10th and the nth terms

If the sum of the first 2n terms of the A.P. 2, 5, 8, ..., is equal to the sum of the first n terms of A.P. 57, 59, 61, ..., then n equals

If the nth term of an A.P. is t_(n) =3 -5n , then the sum of the first n terms is ………

If the 7^(th) term of n A.P is 40. Then the sum of its first 13 terms is

If the sum of first p terms of an A.P. is equal to the sum of the first q terms, then find the sum of the first (p + q) terms.

Find the sum of first 24 terms of the list of numbers whose nth term is given by a_(n)=3+2n .

Given that 3 is the first term and sixth term of an AP is 23. Find the remaining terms between first and sixth terms.

Find the sum of the first 28 terms of an A.P. whose nth term is 4n-3.

The 104th term and 4th term of an A.P. are 125 and 0. Find the sum of first 35 terms.

If the sum of m terms of an A.P. is same as the sum of its n terms, then the sum of its (m+n) terms is